Shell and devein shrimp.,Melt butter and saute shrimp over medium low heat until pink.,Remove to casserole dish.,Add chopped tomatoes, onions and garlic to pan.,______,Pour sauce over shrimps and arrange thin slices of cheese over it.,(Note - I have never run across Feta that one could slice - it's usually sold in crumbles here - so sprinkle crumbles on shrimp!,).,Serve immediately, or place under broiler for 2 minute to toast cheese.